Class9_Science_First Law of Motion
An object by its own does not change its state of rest or uniform motion. This inability of any object to change its state is called inertia. Newton's first law of motion gives the concept of inertia and force. According to the law, any object in the universe remains in its state of rest or uniform motion. Inertia is of three types, namely Inertia of rest, Inertia of motion and Inertia of direction. Mass of an object is an intrinsic property of matter.